/*
 * =============================================================================
 * Copyright by Benjamin Sempere,
 * All rights reserved.
 * =============================================================================
 * Author  : Benjamin Sempere
 * E-mail  : benjamin@sempere.org
 * Homepage: www.sempere.org
 * =============================================================================
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.sempere.commons.proxy;

import java.lang.reflect.*;
import java.util.*;

/**
 * Handler relying to a Checker instance in order to check the validity of an object.
 *
 * @author bsempere
 */
public class ChainingHandler<T> extends DelegateHandler<T> {

	// handlers chain
	private List<InvocationHandler> handlers = new ArrayList<InvocationHandler>();

	// *************************************************************************
	//
	// Constructors
	//
	// *************************************************************************

	public ChainingHandler(T delegate) {
		super(delegate);
	}

	public ChainingHandler(T delegate, List<InvocationHandler> handlers) {
		this(delegate);
		this.handlers = handlers;
	}

	public ChainingHandler(T delegate, InvocationHandler... handlers) {
		this(delegate);
		if (handlers != null) {
			this.handlers = Arrays.asList(handlers);
		}
	}

	// *************************************************************************
	//
	// Methods from InvocationHandler interface
	//
	// *************************************************************************

	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		for (InvocationHandler handler : this.handlers) {
			handler.invoke(proxy, method, args);
		}
		return super.invoke(proxy, method, args);
	}

	// *************************************************************************
	//
	// Convenience methods
	//
	// *************************************************************************

	public void addHandler(InvocationHandler handler) {
		this.handlers.add(handler);
	}

	public void addHandlers(List<InvocationHandler> handlers) {
		if (handlers != null) {
			this.handlers.addAll(handlers);
		}
	}

	public void addHandlers(InvocationHandler... handlers) {
		this.addHandlers(Arrays.asList(handlers));
	}
}